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Quarterly Groundwater Monitoring Report No 2 February 9, 1998 ' from 2 9 b to 310 • pp ppb Laboratory results from the two remaining monitoring wells, SRK- ' MW2 and BEI-MW3, indicated TPHg concentrations in excess of 10,000 ppb at 32,000 ppb and 44,000 ppb, respectively, with BTEX concentrations ranging from 37 ppb to 4,700 ppb ' These results indicated a general increase in detected concentrations in the groundwater samples collected from monitoring wells BEI-MW2, SRK-MW-2, MW-7 and MW-8, and a general decrease in detected concentration in the groundwater samples collected from monitoring wells ' BEI-MWI, BEI-MW3, SRK-MWl and SRK-MW3 The current analytical results are shown on Figure 3, the current and previous OST sampling analytical results are shown on Table 2 ' Historical analytical data are included in Appendix B The Certified Analytical Reports and Chain of Custody Records are included in Appendix C 4.2 Groundwater Elevations and Gradients ' A summary of the groundwater elevation measurements from current and previous OST monitoring 1s shown on Table 3 Groundwater elevation contours for January 16, 1998 are shown on Figure 4 Since the September 10, 1997 sampling, measurements to the top of the ' groundwater indicate an average groundwater rise of approximately 128 feet,ranging from 1 18 feet in monitoring well BEI-MW2 to 132 feet in monitoring wells SRK-MW1, SRK-MW3 and l MW-7 On January 16, 1998,the direction of groundwater flow was generally to the north, at ie a gradient which ranged from approximately 0 001 to 0 002 These results compare favorably with the previous gradient and directions Historical groundwater elevation data and ' groundwater gradients are included in Appendix B Copies of the field purge/sampling worksheets are included as Appendix A ' 50 SELF-MONITORING PROGRAM SCHEDULE ' The next quarterly groundwater monitoring event is scheduled for the second quarter of 1998 1 ' OST 701-1-2 qm2 Page 4